Movie/film roles in which Clea DuVall played a crazy person

• Buffy the Vampire Slayer: plays a girl who is so shy she becomes invisible, goes crazy, tries to perform some amateur plastic surgery on Cordelia, and then eventually becomes a member of the Invisible FBI
  
• Girl, Interrupted: plays an inmate of a mental hospital
  
• Popular, season 1: Plays a cheerleader driven mad, who appears in a straitjacket fondling a stuffed armadillo
  
• Season 6 of CSI: Plays a cult member who lives in an abandoned bunker in the desert and voluntarily drinks the kool-aid, or in this case, the special vodka

This constitutes 100% of the times I have seen her. (Actually now that I think about it I have seen 13 Conversations About One Thing. I just don't remember it.) I don't watch Heroes. Is she a psycho on Heroes? We should begin a letter-writing campaign. Dear Hollywood: We believe that, if given the chance, Clea DuVall COULD play a sane person!